[linux-2.6-block.git] / drivers / scsi / a3000.c

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#include "a3000.h"

#include<linux/stat.h>

#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))

static struct Scsi_Host *a3000_host = NULL;

static int a3000_release(struct Scsi_Host *instance);

static irqreturn_t a3000_intr (int irq, void *dummy)
{
	unsigned long flags;
	unsigned int status = DMA(a3000_host)->ISTR;

	if (!(status & ISTR_INT_P))
		return IRQ_NONE;
	if (status & ISTR_INTS)
	{
		spin_lock_irqsave(a3000_host->host_lock, flags);
		wd33c93_intr (a3000_host);
		spin_unlock_irqrestore(a3000_host->host_lock, flags);
		return IRQ_HANDLED;
	}
	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	return IRQ_NONE;
}

static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
    unsigned long addr = virt_to_bus(cmd->SCp.ptr);

    /*
     * if the physical address has the wrong alignment, or if
     * physical address is bad, or if it is a write and at the
     * end of a physical memory chunk, then allocate a bounce
     * buffer
     */
    if (addr & A3000_XFER_MASK)
    {
	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	    & ~0x1ff;
	HDATA(a3000_host)->dma_bounce_buffer =
	    kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
	
	/* can't allocate memory; use PIO */
	if (!HDATA(a3000_host)->dma_bounce_buffer) {
	    HDATA(a3000_host)->dma_bounce_len = 0;
	    return 1;
	}

	if (!dir_in) {
	    /* copy to bounce buffer for a write */
	    memcpy (HDATA(a3000_host)->dma_bounce_buffer,
		cmd->SCp.ptr, cmd->SCp.this_residual);
	}

	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
    }

    /* setup dma direction */
    if (!dir_in)
	cntr |= CNTR_DDIR;

    /* remember direction */
    HDATA(a3000_host)->dma_dir = dir_in;

    DMA(a3000_host)->CNTR = cntr;

    /* setup DMA *physical* address */
    DMA(a3000_host)->ACR = addr;

    if (dir_in)
  	/* invalidate any cache */
	cache_clear (addr, cmd->SCp.this_residual);
    else
	/* push any dirty cache */
	cache_push (addr, cmd->SCp.this_residual);

    /* start DMA */
    mb();			/* make sure setup is completed */
    DMA(a3000_host)->ST_DMA = 1;
    mb();			/* make sure DMA has started before next IO */

    /* return success */
    return 0;
}

static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
		     int status)
{
    /* disable SCSI interrupts */
    unsigned short cntr = CNTR_PDMD;

    if (!HDATA(instance)->dma_dir)
	cntr |= CNTR_DDIR;

    DMA(instance)->CNTR = cntr;
    mb();			/* make sure CNTR is updated before next IO */

    /* flush if we were reading */
    if (HDATA(instance)->dma_dir) {
	DMA(instance)->FLUSH = 1;
	mb();			/* don't allow prefetch */
	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
	    barrier();
	mb();			/* no IO until FLUSH is done */
    }

    /* clear a possible interrupt */
    /* I think that this CINT is only necessary if you are
     * using the terminal count features.   HM 7 Mar 1994
     */
    DMA(instance)->CINT = 1;

    /* stop DMA */
    DMA(instance)->SP_DMA = 1;
    mb();			/* make sure DMA is stopped before next IO */

    /* restore the CONTROL bits (minus the direction flag) */
    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
    mb();			/* make sure CNTR is updated before next IO */

    /* copy from a bounce buffer, if necessary */
    if (status && HDATA(instance)->dma_bounce_buffer) {
	if (SCpnt) {
	    if (HDATA(instance)->dma_dir && SCpnt)
		memcpy (SCpnt->SCp.ptr,
			HDATA(instance)->dma_bounce_buffer,
			SCpnt->SCp.this_residual);
	    kfree (HDATA(instance)->dma_bounce_buffer);
	    HDATA(instance)->dma_bounce_buffer = NULL;
	    HDATA(instance)->dma_bounce_len = 0;
	} else {
	    kfree (HDATA(instance)->dma_bounce_buffer);
	    HDATA(instance)->dma_bounce_buffer = NULL;
	    HDATA(instance)->dma_bounce_len = 0;
	}
    }
}

static int __init a3000_detect(struct scsi_host_template *tpnt)
{
    wd33c93_regs regs;

    if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
	return 0;
    if (!request_mem_region(0xDD0000, 256, "wd33c93"))
	return 0;

    tpnt->proc_name = "A3000";
    tpnt->proc_info = &wd33c93_proc_info;

    a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
    if (a3000_host == NULL)
	goto fail_register;

    a3000_host->base = ZTWO_VADDR(0xDD0000);
    a3000_host->irq = IRQ_AMIGA_PORTS;
    DMA(a3000_host)->DAWR = DAWR_A3000;
    regs.SASR = &(DMA(a3000_host)->SASR);
    regs.SCMD = &(DMA(a3000_host)->SCMD);
    HDATA(a3000_host)->no_sync = 0xff;
    HDATA(a3000_host)->fast = 0;
    HDATA(a3000_host)->dma_mode = CTRL_DMA;
    wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
    if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
		    a3000_intr))
        goto fail_irq;
    DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;

    return 1;

fail_irq:
    wd33c93_release();
    scsi_unregister(a3000_host);
fail_register:
    release_mem_region(0xDD0000, 256);
    return 0;
}

static int a3000_bus_reset(struct scsi_cmnd *cmd)
{
	/* FIXME perform bus-specific reset */
	
	/* FIXME 2: kill this entire function, which should
	   cause mid-layer to call wd33c93_host_reset anyway? */

	spin_lock_irq(cmd->device->host->host_lock);
	wd33c93_host_reset(cmd);
	spin_unlock_irq(cmd->device->host->host_lock);

	return SUCCESS;
}

#define HOSTS_C

static struct scsi_host_template driver_template = {
	.proc_name		= "A3000",
	.name			= "Amiga 3000 built-in SCSI",
	.detect			= a3000_detect,
	.release		= a3000_release,
	.queuecommand		= wd33c93_queuecommand,
	.eh_abort_handler	= wd33c93_abort,
	.eh_bus_reset_handler	= a3000_bus_reset,
	.eh_host_reset_handler	= wd33c93_host_reset,
	.can_queue		= CAN_QUEUE,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= CMD_PER_LUN,
	.use_clustering		= ENABLE_CLUSTERING
};


#include "scsi_module.c"

static int a3000_release(struct Scsi_Host *instance)
{
    wd33c93_release();
    DMA(instance)->CNTR = 0;
    release_mem_region(0xDD0000, 256);
    free_irq(IRQ_AMIGA_PORTS, a3000_intr);
    return 1;
}

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	#include <linux/types.h>
	2	#include <linux/mm.h>
	3	#include <linux/blkdev.h>
1da177e4 LT	4	#include <linux/ioport.h>
	5	#include <linux/init.h>
	6	#include <linux/spinlock.h>
	7	#include <linux/interrupt.h>
	8
	9	#include <asm/setup.h>
	10	#include <asm/page.h>
	11	#include <asm/pgtable.h>
	12	#include <asm/amigaints.h>
	13	#include <asm/amigahw.h>
	14	#include <asm/irq.h>
	15
	16	#include "scsi.h"
	17	#include <scsi/scsi_host.h>
	18	#include "wd33c93.h"
	19	#include "a3000.h"
	20
	21	#include<linux/stat.h>
	22
	23	#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
	24	#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
	25
	26	static struct Scsi_Host *a3000_host = NULL;
	27
9387edbe AB	28	static int a3000_release(struct Scsi_Host *instance);
9387edbe AB	29
7d12e780	30	static irqreturn_t a3000_intr (int irq, void *dummy)
1da177e4 LT	31	{
	32	unsigned long flags;
	33	unsigned int status = DMA(a3000_host)->ISTR;
	34
	35	if (!(status & ISTR_INT_P))
	36	return IRQ_NONE;
	37	if (status & ISTR_INTS)
	38	{
	39	spin_lock_irqsave(a3000_host->host_lock, flags);
	40	wd33c93_intr (a3000_host);
	41	spin_unlock_irqrestore(a3000_host->host_lock, flags);
	42	return IRQ_HANDLED;
	43	}
	44	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	45	return IRQ_NONE;
	46	}
	47
65396410	48	static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
1da177e4 LT	49	{
	50	unsigned short cntr = CNTR_PDMD \| CNTR_INTEN;
	51	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	52
	53	/*
	54	* if the physical address has the wrong alignment, or if
	55	* physical address is bad, or if it is a write and at the
	56	* end of a physical memory chunk, then allocate a bounce
	57	* buffer
	58	*/
7b892806	59	if (addr & A3000_XFER_MASK)
1da177e4 LT	60	{
	61	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	62	& ~0x1ff;
	63	HDATA(a3000_host)->dma_bounce_buffer =
	64	kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
	65
	66	/* can't allocate memory; use PIO */
	67	if (!HDATA(a3000_host)->dma_bounce_buffer) {
	68	HDATA(a3000_host)->dma_bounce_len = 0;
	69	return 1;
	70	}
	71
	72	if (!dir_in) {
	73	/* copy to bounce buffer for a write */
cc0455fa BH	74	memcpy (HDATA(a3000_host)->dma_bounce_buffer,
cc0455fa BH	75	cmd->SCp.ptr, cmd->SCp.this_residual);
1da177e4 LT	76	}
	77
	78	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
	79	}
	80
	81	/* setup dma direction */
	82	if (!dir_in)
	83	cntr \|= CNTR_DDIR;
	84
	85	/* remember direction */
	86	HDATA(a3000_host)->dma_dir = dir_in;
	87
	88	DMA(a3000_host)->CNTR = cntr;
	89
	90	/* setup DMA physical address */
	91	DMA(a3000_host)->ACR = addr;
	92
	93	if (dir_in)
	94	/* invalidate any cache */
	95	cache_clear (addr, cmd->SCp.this_residual);
	96	else
	97	/* push any dirty cache */
	98	cache_push (addr, cmd->SCp.this_residual);
	99
	100	/* start DMA */
	101	mb(); /* make sure setup is completed */
	102	DMA(a3000_host)->ST_DMA = 1;
	103	mb(); /* make sure DMA has started before next IO */
	104
	105	/* return success */
	106	return 0;
	107	}
	108
65396410 HK	109	static void dma_stop(struct Scsi_Host instance, struct scsi_cmnd SCpnt,
65396410 HK	110	int status)
1da177e4 LT	111	{
	112	/* disable SCSI interrupts */
	113	unsigned short cntr = CNTR_PDMD;
	114
	115	if (!HDATA(instance)->dma_dir)
	116	cntr \|= CNTR_DDIR;
	117
	118	DMA(instance)->CNTR = cntr;
	119	mb(); /* make sure CNTR is updated before next IO */
	120
	121	/* flush if we were reading */
	122	if (HDATA(instance)->dma_dir) {
	123	DMA(instance)->FLUSH = 1;
	124	mb(); /* don't allow prefetch */
	125	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
	126	barrier();
	127	mb(); /* no IO until FLUSH is done */
	128	}
	129
	130	/* clear a possible interrupt */
	131	/* I think that this CINT is only necessary if you are
	132	* using the terminal count features. HM 7 Mar 1994
	133	*/
	134	DMA(instance)->CINT = 1;
	135
	136	/* stop DMA */
	137	DMA(instance)->SP_DMA = 1;
	138	mb(); /* make sure DMA is stopped before next IO */
	139
	140	/* restore the CONTROL bits (minus the direction flag) */
	141	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	142	mb(); /* make sure CNTR is updated before next IO */
	143
	144	/* copy from a bounce buffer, if necessary */
	145	if (status && HDATA(instance)->dma_bounce_buffer) {
cc0455fa	146	if (SCpnt) {
1da177e4 LT	147	if (HDATA(instance)->dma_dir && SCpnt)
	148	memcpy (SCpnt->SCp.ptr,
	149	HDATA(instance)->dma_bounce_buffer,
	150	SCpnt->SCp.this_residual);
	151	kfree (HDATA(instance)->dma_bounce_buffer);
	152	HDATA(instance)->dma_bounce_buffer = NULL;
	153	HDATA(instance)->dma_bounce_len = 0;
	154	} else {
1da177e4 LT	155	kfree (HDATA(instance)->dma_bounce_buffer);
	156	HDATA(instance)->dma_bounce_buffer = NULL;
	157	HDATA(instance)->dma_bounce_len = 0;
	158	}
	159	}
	160	}
	161
9387edbe	162	static int __init a3000_detect(struct scsi_host_template *tpnt)
1da177e4 LT	163	{
	164	wd33c93_regs regs;
	165
	166	if (!MACH_IS_AMIGA \|\| !AMIGAHW_PRESENT(A3000_SCSI))
	167	return 0;
	168	if (!request_mem_region(0xDD0000, 256, "wd33c93"))
	169	return 0;
	170
	171	tpnt->proc_name = "A3000";
	172	tpnt->proc_info = &wd33c93_proc_info;
	173
	174	a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
	175	if (a3000_host == NULL)
	176	goto fail_register;
	177
	178	a3000_host->base = ZTWO_VADDR(0xDD0000);
	179	a3000_host->irq = IRQ_AMIGA_PORTS;
	180	DMA(a3000_host)->DAWR = DAWR_A3000;
	181	regs.SASR = &(DMA(a3000_host)->SASR);
	182	regs.SCMD = &(DMA(a3000_host)->SCMD);
be3cb3d8 TB	183	HDATA(a3000_host)->no_sync = 0xff;
	184	HDATA(a3000_host)->fast = 0;
	185	HDATA(a3000_host)->dma_mode = CTRL_DMA;
1da177e4	186	wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
1d6f359a	187	if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
1da177e4 LT	188	a3000_intr))
	189	goto fail_irq;
	190	DMA(a3000_host)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	191
	192	return 1;
	193
	194	fail_irq:
	195	wd33c93_release();
	196	scsi_unregister(a3000_host);
	197	fail_register:
	198	release_mem_region(0xDD0000, 256);
	199	return 0;
	200	}
	201
65396410	202	static int a3000_bus_reset(struct scsi_cmnd *cmd)
1da177e4 LT	203	{
1da177e4 LT	204	/* FIXME perform bus-specific reset */
df0ae249 JG	205
	206	/* FIXME 2: kill this entire function, which should
	207	cause mid-layer to call wd33c93_host_reset anyway? */
68b3aa7c JG	208
68b3aa7c JG	209	spin_lock_irq(cmd->device->host->host_lock);
1da177e4	210	wd33c93_host_reset(cmd);
68b3aa7c JG	211	spin_unlock_irq(cmd->device->host->host_lock);
68b3aa7c JG	212
1da177e4 LT	213	return SUCCESS;
	214	}
	215
	216	#define HOSTS_C
	217
d0be4a7d	218	static struct scsi_host_template driver_template = {
1da177e4 LT	219	.proc_name = "A3000",
	220	.name = "Amiga 3000 built-in SCSI",
	221	.detect = a3000_detect,
	222	.release = a3000_release,
	223	.queuecommand = wd33c93_queuecommand,
	224	.eh_abort_handler = wd33c93_abort,
	225	.eh_bus_reset_handler = a3000_bus_reset,
	226	.eh_host_reset_handler = wd33c93_host_reset,
	227	.can_queue = CAN_QUEUE,
	228	.this_id = 7,
	229	.sg_tablesize = SG_ALL,
	230	.cmd_per_lun = CMD_PER_LUN,
	231	.use_clustering = ENABLE_CLUSTERING
	232	};
	233
	234
	235	#include "scsi_module.c"
	236
9387edbe	237	static int a3000_release(struct Scsi_Host *instance)
1da177e4 LT	238	{
	239	wd33c93_release();
	240	DMA(instance)->CNTR = 0;
	241	release_mem_region(0xDD0000, 256);
	242	free_irq(IRQ_AMIGA_PORTS, a3000_intr);
	243	return 1;
	244	}
	245
	246	MODULE_LICENSE("GPL");